JP3522491B2 - Powder slush molding equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder slush molding apparatus for producing a two-layer integrally molded product. 2. Description of the Related Art A synthetic resin powder in a powder box is put into a heated mold, and the mold is rotated to form a powder layer along the mold. A powder slush molding method for molding a product by cooling the powder is well known. As shown in FIG. 5, there is a case where a two-layer integrally molded product of an a layer and a b layer is manufactured by the above powder slush molding method. In these two layers, layer a is a transparent layer and layer b is
The layers are colored layers, and the layers a and b are layers of different colors. In the case of the layers of different colors, a backing material is filled between the layers a and b. [0004] In such a method for forming a powder slush of two different layers, when the layer a is a transparent layer and the layer b is a colored layer, the powder is air when forming the transparent layer. To create air bubbles c inside the a layer,
Since the air bubbles c reflect light, there is a problem that the transparent layer becomes cloudy and it is difficult to obtain a transparent feeling. Further, when the layers a and b are layers of different colors, at least two powder boxes, a powder box containing a different kind of powder having a partition plate and a powder box not containing a partition plate containing a backing material, are used. The two powder boxes need to be replaced, and there is a problem that a lot of powder box equipment and a lot of manufacturing time are required. SUMMARY OF THE INVENTION An object of the present invention is to provide a powder slush molding apparatus capable of producing a two-layer integrally molded product in a short time without generating bubbles in the layer. SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a powder box mounted on a rotating frame rotated by a rotary driving device, and a side opposite to a mounting surface of the powder box. Sheet carry-in heating means for carrying the synthetic resin sheet onto the rotating frame and heating it,
A porous electroforming mold set on the synthetic resin sheet which has been heated in advance and carried on the rotating frame by the sheet carrying-in heating means, and which is set on the rotating frame so as to surround the periphery of the porous electroforming mold and is connected to the evacuation device. The synthetic resin sheet conveyed on the rotating frame is vacuum-formed with a porous electroforming mold, and then the rotating frame is turned over and the synthetic resin powder in the powder box is vacuum-formed with the porous electroforming mold. The powder is filled in a synthetic resin sheet, powdered, and a two-layer integrally molded product of a synthetic resin sheet layer formed by vacuum forming and a powder slush formed layer formed by powder slush forming is manufactured. An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a support, on which a rotating frame 2 rotated by a rotation driving device 3.
Are supported in the horizontal direction. 4 is a synthetic resin powder 5
This is a powder box containing (PVC) and is lifted by a lifter 6 and mounted on the rotating frame 2. This configuration is a so-called powdering device. Reference numeral 7 denotes a sheet carrying-in heating means. The sheet loading / heating means 7 includes a horizontal sheet setting clamper 7a, a sheet heating heater 7b disposed in parallel above the sheet setting clamper 7a, a sheet setting clamper 7a and a sheet heating heater 7b.
And a cylinder 7c for moving forward and backward on the rotating frame 2 opposite to the mounting surface of the powder box 2, and a synthetic resin sheet 8a (PVC natural) is wound below the sheet setting clamper 7a. The taken sheet roll 8 is installed. On the rotating frame 2 into which the synthetic resin sheet 8a is carried, a pre-heated porous electroform 9 is set, and a vacuum chamber 10 is set so as to surround the porous electroform 9. You. The vacuum chamber 10 is connected to a vacuum device. This vacuum pumping device comprises a vacuum pump 13, a vacuum tank 14 connected to the vacuum pump 13, and a connection port 12 piped through the vacuum tank 14 and a valve 15 and fixed to the rotary frame 2. A connection pipe 11 connected to the connection port 12 is provided in the vacuum chamber 10.
Is provided. As shown in FIG. 2, a seal 12 a is provided on the flange surface of the connection port 12 so as to prevent air leakage by contact with the flange of the connection pipe 11. A molding process using the apparatus of the present invention having the above-described structure will be described with reference to FIGS. As shown in a porous electroforming heating step A of FIG. 3, the porous electroforming mold 9 is heated to a required temperature in the mold heating furnace 16. On the other hand, in the powdering apparatus, as shown in the sheet clamping and heating step B, the synthetic resin sheet 8a rewound from the sheet roll 8 is clamped by the sheet setting clamper 7a, and the cylinder 7c is operated to form the sheet setting clamper 7a. The synthetic resin sheet 8a is carried onto the rotating frame 2 by moving the sheet heating heater 7b forward. Then, the synthetic resin sheet 8a carried into the rotating frame 2 is heated by the sheet heating heater 7b. [0012] The synthetic resin sheet 8a is
After being loaded and heated, as shown in the powder box setting step C, the sheet setting clamper 7a and the sheet heating heater 7b move backward, and the powder box 4 is lifted by the lifter 6 and mounted on the lower surface of the rotating frame 2. Is done. On the other hand, the porous electroform 9 heated in the heating furnace 16 is set on a synthetic resin sheet 8a carried on the rotating frame 2, as shown in a porous electroform setting step D. Thereafter, as shown in a vacuum chamber setting step E, the vacuum chamber 10 is set so as to surround the porous electroform 9. At this time, the connection pipe 11 of the vacuum chamber 10 contacts the connection port 12 fixed to the rotating frame 2 and is connected to the evacuation device. Next, as shown in a vacuum forming step F in FIG.
The valve 15 is opened to evacuate the vacuum chamber 10. As a result, the synthetic resin sheet 8a is vacuum-sucked from the porous hole of the porous electroform 9, is attracted to the porous electroform 9, is heated and melted, and is vacuum-formed. After the synthetic resin sheet 8a is vacuum-formed, as shown in a powder ring process G, the rotating frame 2 is rotated to invert the powder box 4 and the porous electroforming mold 9, and the synthetic resin in the powder box 4 is removed. Powder 5
Is filled in a synthetic resin sheet 8a vacuum-formed with a porous electroform 9 and powdered. The opening of the powder box 4 penetrates the rotating frame 2 and faces the porous electroforming mold 9 side. When the powder box 4 is turned upside down, the synthetic resin powder 5 drops to the porous electroforming mold 9 side. Then, when the powder box 4 is turned downward, the synthetic resin powder 5 in the porous electroforming mold 9 falls into the powder box 4 and is returned. After the powdering step G, as shown in the porous electroforming mold / powder box unclamping step H, the powder box 4 is turned upside down so that the powder electroforming mold 9 is positioned above and the porous electroforming mold 9 is positioned above. In the porous electroform 9 turned upside down, a layer of the synthetic resin sheet 8a melted and formed in the vacuum forming step F and a powder slush in which the synthetic resin powder 5 adheres and melts to the synthetic resin sheet 8a in the powder ring step G. A two-layer integrally molded product W with the molded layer 5a is molded. The unclamped porous electroform 9 is cooled in a cooling bath 17 as shown in a porous electromold cooling step I, and as shown in a demolding step J, the layer of the synthetic resin sheet 8a is The two-step integrated molding W with the powder slush molding layer 5a formed by powder slush molding is released from the mold to complete the entire process. In the two-layer integrally formed product W, air bubbles are generated in the transparent synthetic resin sheet 8a by using the synthetic resin sheet 8a as a transparent layer of a transparent sheet and the powder slush molding layer 5a as a colored layer. And a good transparency can be obtained. Further, a patterned sheet can be used in place of the transparent sheet, and a molded article having a design that has never been seen before can be obtained. Furthermore, in the case of a different color layer, the synthetic resin sheet 8a and the synthetic resin powder are made to have different colors, so that a powder box containing a different kind of powder having a partition plate and a powder box not containing a partition plate containing a backing material are provided. And no need for at least two powder boxes. As described above, according to the present invention, one layer of the two-piece integrally molded product is obtained by vacuum-forming a synthetic resin sheet and forming another one-piece product.
The layer is a powder slush molding device that has a vacuum forming function by powder slush molding, so the production time is shorter than that of powder slush molding of all two layers, and a molded product with a transparent layer on the surface In the production of a molded article having two layers of different colors, a powder box containing a different kind of powder having a partition plate and a partition plate containing a backing material can be provided. There is an advantage that the equipment for two powder boxes having different powder box structures and the work of exchanging the powder boxes are not required, so that equipment cost and manufacturing time can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of the apparatus of the present invention. FIG. 2 is a detailed view of a connection portion between a vacuum chamber and a vacuum evacuation apparatus. FIG. FIG. 4 is a process diagram showing the latter half of the molding process using the apparatus of the present invention. FIG. 5 is a cross-sectional view showing a defect between a conventional transparent layer and a colored layer. Powder box 5 Synthetic resin powder 6 Lifter 7 Sheet loading / heating means 7a Sheet setting clamper 7b Sheet heating heater 7c Cylinder 8 Sheet roll 8a Synthetic resin sheet 9 Porous mold 10 Vacuum chamber 11 Connection tube 12 Connection port 12a Seal 13 Vacuum pump 14 Vacuum tank 15 Valve 16 Heating furnace

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Claims (1)

(57) [Claim 1] A synthetic resin sheet is loaded on a powder box mounted on a rotating frame rotated by a rotary drive device and on a rotating frame opposite to a mounting surface of the powder box. Sheet carrying heating means for heating the sheet,
A porous electroforming mold set on the synthetic resin sheet which has been heated in advance and carried on the rotating frame by the sheet carrying-in heating means, and which is set on the rotating frame so as to surround the periphery of the porous electroforming mold and is connected to the evacuation device. The synthetic resin sheet conveyed on the rotating frame is vacuum-formed with a porous electroforming mold, and then the rotating frame is turned over and the synthetic resin powder in the powder box is vacuum-formed with the porous electroforming mold. A powder slush molding apparatus characterized by producing a two-layer integrated product of a synthetic resin sheet layer formed by vacuum forming and a powder slush molded layer formed by vacuum slush molding.